diff --git a/plugins/systemd/timesync_status b/plugins/systemd/timesync_status
index 63eb8ec8..c223d633 100755
--- a/plugins/systemd/timesync_status
+++ b/plugins/systemd/timesync_status
@@ -57,6 +57,10 @@ def parse_time(value):
     if ' ' in value:
         return sum(parse_time(x) for x in value.split(' '))
 
+    # If time is exactly zero (for example Jitter), there is no unit (suffix)
+    if value == "0" or value == "-0":
+        return 0
+
     match = re.match(r'^([+-]?[0-9.]+)([a-z]+)$', value)
     if not match:
         raise ValueError('Invalid time ' + value)